Effect of Branched Hydrophobic Group on the Surface Dilational Rheology of Betaine Surfactants

doi:10.7503/cjcu20170050

Abstract

Abstract:

The surface dilational rheological properties ofisomeric compounds, straight chain(C₁₆PB) and branched chain(C₁₆GPB) hexadecyl hydroxypropyl carboxybetaines were investigated by drop shape analysis. The influences of ageing time, surface pressure, dilational frequency and bulk concentration on surface dilational modulus and phase angle were expounded. It is found that the whole hydrophilic part of betaine molecule inclines to flat on the surface when betaine adsorbs, which will lead to higher dilational modulus. The nature of adsorption film is determined by in-surface processes, such as the variation of orientation of hydrophilic group. The branched hydrophobic alkyl chains of betaine molecules improve the intermolecular interactions, not only results in higher moduli, but causes a maximum in dynamic modulus at high betaine concentration. This result indicates that the strength of surface film is strongly related to molecular arrangement, not simply determined by the surface molecule concentration.

Key words: Betaine, Branched chain, Dilational rheology, Surface pressure

CLC Number:

O647

TrendMD:

GUO Lanlei, ZHU Yangwen, XU Zhicheng, GONG Qingtao, JIN Zhiqiang, ZHANG Lei, ZHANG Lu. Effect of Branched Hydrophobic Group on the Surface Dilational Rheology of Betaine Surfactants[J]. Chem. J. Chinese Universities, 2017, 38(8): 1399.

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